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Finding the Fourth Proportional to 39,903, 55,063.56 and 21,998.16

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Solution

The fourth proportional to 39,903, 55,063.56 and 21,998.16 is: 30,356.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,903 : 55,063.56 = 21,998.16 : x
  2. Step 2: Convert to fraction form
    39,903/55,063.56 = 21,998.16/x
  3. Step 3: Cross multiply
    39,903x = 55,063.56 × 21,998.16
  4. Step 4: Simplify right side
    39,903x = 1,211,297,003.05
  5. Step 5: Solve for x
    x = 1,211,297,003.05/39,903
  6. Step 6: Final answer
    x = 30,356.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.